用于铸态高性能有机太阳能电池的具有小乌尔巴赫能量的硒杂环电子受体
Selenium Heterocyclic Electron Acceptor with Small Urbach Energy for As-Cast High-Performance Organic Solar Cells.
作者信息
Zhang Zhenzhen, Li Yawen, Cai Guilong, Zhang Yihang, Lu Xinhui, Lin Yuze
机构信息
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
出版信息
J Am Chem Soc. 2020 Nov 4;142(44):18741-18745. doi: 10.1021/jacs.0c08557. Epub 2020 Oct 21.
Typical organic photovoltaic materials show high Urbach energies (ca. 25-50 meV), which is considerably higher than those of their inorganic counterparts and limits further improvement in the device efficiency of organic solar cells (OSCs). In this study, we introduce a facile method of selenium substitution to reduce the Urbach energy of organic photovoltaic materials to 20.4 meV (Y6Se), which is the lowest value reported for high-performance organic photovoltaic materials and very close to those (ca. 15 meV) of typical inorganic/hybrid semiconductors, such as crystalline silicon, gallium nitride, and lead-halide perovskite. Next, OSCs based on Y6Se showed 17.7% efficiency, which is among the best results for OSCs and the record efficiency of as-cast single junction OSCs to date.
典型的有机光伏材料具有较高的乌尔巴赫能量（约25-50毫电子伏特），这比其无机对应物的乌尔巴赫能量高得多，限制了有机太阳能电池（OSC）器件效率的进一步提高。在本研究中，我们引入了一种简便的硒取代方法，将有机光伏材料的乌尔巴赫能量降低至20.4毫电子伏特（Y6Se），这是高性能有机光伏材料报道的最低值，非常接近典型无机/混合半导体（如晶体硅、氮化镓和卤化铅钙钛矿）的乌尔巴赫能量（约15毫电子伏特）。接下来，基于Y6Se的OSC显示出17.7%的效率，这是OSC的最佳结果之一，也是迄今为止铸态单结OSC的最高效率记录。
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